Paper-making machine



H. BAETZ.

PAPER MAKING MACHINE.

APPLICATION FILED IAN. I3, I92I.

PAIIIIIIQII 1250.121922.

3 SHEETS-SHEET I.

H. BAETZ.

PAPER MAKING MACHINE. APPLICATION FILED 1AN.13,192|.

Patented Dec. 12, 1922.

-H. BAET.

PAPER MAKING MACHINE.

APPucATxoN FILED 1AN.13. 192|.

1,438,210., Patented De@.'12,1922;

3 SHEETS-SHEET 3.

WWE

Patented Dec. 12, 1922.

Y 1,438,210 UNITED srATEsfPATENT OFFICE.

HENRY BAETZ, OF ST. LOUIS, MISSOURI, ASSIGNOR TO FRED A. C. SKINNER. AND

MERRILL G. SKINNER, BOTH 0F ST. LOUIS, MISSOURI.

PAPER-MAKING MACHINE.

Application led June 13, 1921. Seria1 No. 477,216.

To all whom. t may concern.'

Be it known that I, HENRY BAETZ, a citizen of the United States, residing at St. Louis,` State of Missouri. have invented certain new and useful Improvements in Paper-Making Machines, of which the following is a specification.

My invention has relation to improvements in paper-making machines, and is particularly directed to the drying rolls of a ma chine of the continuous web type. As is well understood in the art, paper-making machines of this type consist in a sieve of endless wire cloth carried on rollers, onto which the pulp is run and carried to a dandy roll which determines the character of the paper. The web is then passed' through rolls where the water is squeezed out, after which it passes over the driers which consist of rolls or hollow cylinders heated with steam. It is in connection with these drying rolls that my invention is utilized, to expedite the drying operation. The invention consists specifically in the application to the paper web of suitable nozzles for discharging heated air over the surface of the web substantially parallel thereto so as to assist in the vaporization of the moisture and at the same time carry the vapor and steam away from the web, maintaining the atmosphere in the vicinity of the web in a comparative state of dryness. These objects together with other advantages will be better apparent from a detailed description of the invention in connection with the accompanying drawings, in which- Figure l is a cross-section through the building wherein the drying rolls are mounted showing my invention applied thereto; Fig. 2 is a diagrammatic view of the drying rolls with my invention installed for operation in connection therewith; Fig. 3 is an enlarged end view of three drying rolls over which the paper web is passed show` ing the disposition of the air conduit and nozzles so as to discharge the heated air into the pocket formed beneath the upper roll: Fig. 4 is a vertical transverse section taken on the line 4-4 of Fig. 3: Fig. 5 is a detached view of a portion of the bifurcated conduit looking into the nozzles.

Referring to the drawings l and l represent the upper and lower drying rolls respectivellv supported in a skeleton frame F said rolls having the web 2 passed around them. Idler rollers 3 are mounted beneath the upper rolls l, and a felt web 4 is passed over the idlers 3 and under the rolls l. and thence around idlers 3, at the ends of a certain number of rolls and idlers 3 beneath theidlers 3', the felt web thus constituting an endless belt. As the paper web 2 passes over the rolls l, the felt web 4 likewise passes over said rolls, the paper web 2 however being between the rolls and felt web 4. The felt web thus assists in drying the paper. It will be observed that an upper ocket 5 is formed between the rolls and ower pockets 5', 5 are formed between the felt web' 4, paper web 2 and upper rolls l. Because of the presence of these pockets, the large amount of vapor and steam that is necessarily formed in the drying of the moist web is more or less occluded'between the rolls and greatly retardsy the drying operatlon necessitating a greater number of rolls than would be necessary Were this not the case. In order to overcome this disadvantage and thereby obtain the same drying efficiency with a less number of drying rolls I provide a branched airv conduit 6 arranged beneath each of the upper rolls l, the branches 6, 6', of each of said conduits terminating in nozzles 7, 7 for discharging heated air into the Ypockets 5, 5. It Will be observed (Figures 3 and 4) that the nozzles are slightly inclined outwardly and upwardly, the amount of the inclination being just suiiicient tocause the nozzles to discharge the heated air against the inner surface of the web forming one wall of the pocket 5. As the heated air comes into contact with the web it will aid in drying they web, and being projected into the pocket with some velocity will, of course, expel from the pocket the vapor vand steam given olf from'the web. The air blast is `discharged through the pocket, substantially in the same plane with the web, consequently no steam can lodge therein, an atmosphere of comparative dryness existing in the vicinity of the web and greatly expediting the drying thereof. The conduits 6 receive' the heated air from a header 8 Which Iis in communication with the hot air chamber 9 of a heater 10 to which the air supply is conducted by an intake pipe 11.

The drying operation is further facilitated by providing transversely disposed conduits 12 at' intervals so as to discharge the heated air against and across the under side of the lower lap of the felt web 4, said conduits 12 leading from the header 8. The drying rolls of paper-making machinery are not all provided with a felt web 4 between which and the lower rolls the paper web passes, this felt web bein sometimes dispensed with. In such cases do not need the conduits 12, but the conduits 6 with their discharge nozzles 7 are in no wise disturbed, they being applied in the same manner as when the felt web is used. i

Having described my invention, I claim: l. In a paper drying machine provided with an upper and a pair of lower dr ing rolls around whichthe paper web is adlilpted to travel, thereby forming a pocket between said lower rolls, a divided air conduit arranged at one end of said rolls, each division of said conduit terminating in a nozzle projecting into said pocket contiguous to 0pposite walls of the paper web and in immediate proximity thereto so as to discharge heated air alongsaid walls from one side to vapor from the pocket, and an air-heater for supplying `the conduits.

2. In a paper drying machine provided with an upper and a pair of lower drying rolls around which the paper web is adapted to travel, a series of idler rolls, one of which is mounted between said pair of lower rolls, a felt web adapted to travel over said idlers and around the lower rolls on the outside of the paper web thereby forming pockets between the felt web and the paper web, a divided air conduit arranged at the end of said rolls, each division 'of said conduit terminating in `a nozzle adapted to discharge acurrent of heated air into one of the pockets along the surface of the paper web from one side to the other in planes substantially parallel with the web, and an air-heater for supplying the conduits.

In testimony whereof I hereunto aiix my signature.

HENRY BAETZ 

